Wash and shade dry the water melon seeds. Else, if you get from store you can directly go ahead with the procedure.
Heat a pan and dry roast the seeds first. When they are roasted on all sides, remove and keep it aside.
Then, roast the red chilies and keep it aside.
When both seeds and chilies are cooled, take them in a mixer and grind to a fine powder. When it is all done, finally add the peeled chopped garlic cloves. Pulse it well.
Remove and add the salt. Spread the powder on a plate for it to get dried.